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'On the Question of Absolute Undecidability', 'Why Propositions cannot be concrete' and 'An Introduction to Modal Logic'
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5. Theory of Logic / K. Features of Logics / 4. Completeness
9544
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A system is 'weakly' complete if all wffs are derivable, and 'strongly' if theses are maximised [Hughes/Cresswell]
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5. Theory of Logic / K. Features of Logics / 5. Incompleteness
17894
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We have no argument to show a statement is absolutely undecidable [Koellner]
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